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Revolving Credit Facility and Long-Term Debt - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Line of Credit Facility [Line Items]    
Line of credit facility expiration date Oct. 01, 2017  
Revolving credit facility borrowing capacity $ 19,000,000 $ 4,500,000
Letters of credit outstanding amount 19,400,000  
Interest calculation under revolving credit facility The Agreement also provides for an unused commitment fee of 0.25% per annum on the average daily-unused amount of the revolving credit facility.  
Ratio of restricted and unrestricted cash and marketable securities to workers' compensation and safety incentive liabilities 1.0  
Prohibition on incurring additional indebtedness without the prior approval of the Bank in purchase money financing 200,000  
September 30, 2015 [Member]
    
Line of Credit Facility [Line Items]    
Funded Debt to EBITDA ratio 1.50  
Thereafter [Member]
    
Line of Credit Facility [Line Items]    
Funded Debt to EBITDA ratio 1.25  
Maximum [Member]
    
Line of Credit Facility [Line Items]    
Reduction in borrowing capacity 2,500,000  
Maximum [Member] | September 30, 2014 [Member]
    
Line of Credit Facility [Line Items]    
Funded Debt to EBITDA ratio 1.75  
Minimum [Member]
    
Line of Credit Facility [Line Items]    
Minimum Fixed Charge Coverage ratio 1.25  
Revolving Credit Facility [Member]
    
Line of Credit Facility [Line Items]    
Outstanding borrowings on the revolving credit facility 0  
LIBOR plus rate 1.75%  
Unused commitment fee on unused amount 0.25%  
Interest calculation under revolving credit facility The rate is calculated based on LIBOR plus 1.75%  
Term Loan [Member]
    
Line of Credit Facility [Line Items]    
LIBOR plus rate 2.25%  
Term loan with principal bank 5,300,000  
Payment of monthly installments of term loan $ 18,375  
Term loan from Bank, Interest rate description One month LIBOR plus 2.25%